Speed-governor.



H. G. SAHLIN.

SPEED GOVERNOR.

Prummel-nun In.'1.1sos. A

' Patented Aug. 16,1910.

2 SHEETS-SHEET 2.

Y 3 is an end elevation taken from the secyfixture a1. Upon the UNITED sTATEs PATENT oEEicE.

`immune G. SAHLIN, OF MALDEN, MASSACHUSETTS, ASSIG-NOR 0F FORTY-FIVE ONE- HUNDREDTHS T0 DAVID RICE,` OF BOSTON, MASSACHUSETTS.

SEEED-GO'VERNOR.

967,443, Specification of Letters Patent. Patented Aug, 16,l 191() Application filed January 7, 1908. Serial o 409,615.

shaft although I prefer it to be, as shown, a part integral therewith. Arrangedy to turn freely upon the power shaft is what may be termed a nut or bearing A1 formed in two parts which are held together by o fastenings a3 by which the two parts of the nut may be fastened together to fit over the annular flange a2 onnthe power shaft. The nut is provided with an interior annular recess or incision a4L in which the annular flange a2 is adapted to lit and the flange acts,y accordingly, to hold the nut against a longitudinal movement with. respect to the power shaft, but admits of its turning freely thereon.

The nut A1 is adapted to regular or determinate speed and for this purpose I prefer to employ a water motor v(not shown) contained within a casing B.

b represents the shaft of the water motor revolving in bearings b1, b2 of which the bearing b1 is shown secured to the fixture al and the bearing b2 to the side of the motor casing. I prefer that there should be a connection by positive gear between the nut A1 and governor shaft b in order that there may be regularity in operation and the elimination of loss by slippage. Accordingly there are formed upon the periphery of the nut A1 teeth a forming as it were a geared wheel intermeshing with a gear b3 carried by the 'governor shaft.

The nut Al is adapted in part to extend forward from the end of the power shaft, which part of the nut is internally threaded to embrace a screw or governor member A2 which passes through this forward-extending portion of the nut and extends into a chamber a formed within the power shaft. Extendin vfrom the internal wall of the power shaft ormin the chamber a therein is 'a feather a7 w ich is fastened to the power shaft in any suitable manner and preferably to be overned. This shaft in practice may by being keyed into a wedgeeshaped way as be eit er the main shaft of the part govformed thereiny (see Fig. 4.) This feather erned or other shaft operated thereby. I projects to fit within a longitudinal slot a prefer that it shall be the main shaft inasformed in the screw A2. much as my improved form of governor Upon the end of the screw A2 are formed' is especially adapted to be arranged upon flanges a1", an forming with that portion of the end of the main shaft of any engine, the shaft contained betweenthem a circumferential groove a, 'in which runs an anturbine or other motor. The shaft A is nular collar (L13. Secured to this collar are shown having a bearing a attached to a end of the power shaft the forked ends al* of a lever als. The other end of the lever 'opposite the forked ends A is an annular flange a2. This flange may be an auxiliary part afiixed to the end of the thereof is provided. with a supplemental gear 110 To all wwfm it may concern:

Be it known that I, HENNING G. SAHLiN, of Malden, in the`county of Middlesex and State of Massachusetts, a citizen of the United States, have invented a new and useful Improvement in Speed-Governors, of which the followingis a full, clear, and exactdescription, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

My invention relates to an improved forni of governor especially adapted for regulating the .speed of turbine engines. The improved governor is of that class which employs an engine or inotor auxiliary to the machine or part to be governed and capable of being run at a regular or deter:- minate speed. Governors -of this class have a recognized status to those skilled in the art of speed governors and it -will be un-A necessary to refer to the general operation of governorsof this kind; accordingly the following description will be limited to the mechanical structure and operation of the improved governor which I have made.

The object of my invention is to providea governor of as simple construction as possible and one which can easily be applied to or combined with a turbine or other part to'be governed.

My invention can best be seen and understood by reference to the drawings in whichy f Figure -1 is a plan of the governor and connecting parts. Fig. 2 shows mainly a cross vertical section of the governor. Fig.

power be rotated at a' tional line 3-3 of Fig. 2. Fig. 4 is tion on line l-4: of Fig. l, and Fig. section on line 5-5 of Fig. 1.

Insthe drawings :-A represents what I will term a power shaft inasmuch as it is the shaft operated by the mechanism or part a sec- 5 is av slpeed If the speed s a16 intermeshing with a rack c which is con` nected to operate a controlling valve not shown) contained within a pipe ixture A Referring now to the operation of theldevice: It will be observed that upon the rotation of the power shaft A the screw or governor member A2 will be rotated through the instrumentality of aS at the same speed as that 'at which the shaft is turning. At the same time the power shaft is turning the nut or bearing A1 will be also turning ata constant or determinate of the nut and power aft is the same then the screw or governor member A2 will maintain a constant position. Upon the occurrence of a difference in speed, however, between the power shaft and rotary nut or bearing A1 the power shaft will act to turn the screw A2 in the nut or bearing A1 Y against any but a rotary movement, thereby forcing th@J screw or governor member longitudinally inwardly or outwardly depending on whether the shaft is rotated at a less or reater speed than the speed of the nut; uring this movement the screw will move along the-feather a7 by reason of the slot a9 in the screw. As the screw or governor memberv is moved longitudinally its motion is imparted to operate the speed-controlling valve through the mechanism of the lever a operating the segmental gear al intermeshing with the rack c connecting with the controlling valve, the rack c being moved in one direction or the other for controlling the valve depending as the lever is thrownto Y the right or left by the motion of the screw. Having thus fully described my invention,

the connecting featherv fixed on the end of the shaft` 'spect thereto, a rotatab e I claim and desire to secure by Letters Pat- 'ent of the United States-:-

1. A governor of the character s ecied having a' shaft driven by the part to e governed,' said shaft bein chambered at one end to receive a screw, sai screw being connected to said shaft to rotate therewith and movable into and out from the chamber in said shaft, a nut mounted upon said shaft and rotatable with relatiorrthereto, said nut en aging said screw, and means to rotate sai nut at a predermined and regular rate' of speed.

' 2. having a shaft driven by the part to be governed, said shaft being. chambered at one end and carrying a nut, a screw fitting said nut,

and means comprism a second shaft having a predetermined Spee and gears connecting said shafts whereby said screw and said nut will be rotated as described.`

3. A governor of the character having a shaft driven by the part to be governed, a governor'member driven by said shaft and movable lon 'tudinally with reil nut on said shaft fixed a ainst any but a rotary movement and adapted to be rotated at a constant or determinate speed, said nut having threaded engagement with said governor member, and means whereb said shaft may move said governorvmem er for operating a controlling mechanism a difference the nut. t

HENNING G. SAHLIN. vlitnesses:

J oHN E. R. HAYES,

speedof said shaft andupon the occurrence of specifiedy 50 governor of the character specified 

